TMA Monoblock Class B Car Amplifier RMS Power Rating (14.4V): 4 ohms: 340 watts x 1 chan. 3 ohms: 420 watts x 1 chan. 2 ohm: 500 watts x 1 chan. Max power output: 500 watts x 1 chan. Unregulated PWM switching type power supply Class B Monaural with complementary bi-polar outputs Wired remote bass level control included (mute to 0 dB range) LED power (red) and protect (yellow) indicators Single band bass boost (0 to +12 dB bass boost at 45 Hz) Output polarity reverse control switch Mono channel operation Preamp RCA inputs (line out converter needed for speaker level inputs) Preamp RCA outputs (pass through with unity gain) 3-Way System Protection circuitry (thermal, low load impedance, and speaker short protection) Low level input range: 200mV-4V RMS Heavy duty aluminum alloy heatsink for superb heat dissipation Silver-plated RCA level inputs Silver-plated screw terminals Non-defeatable continuously variable low-pass filter (40-130 Hz, 12 dB/octave) CEA-2006 compliant amplifier Frequency response: 10-100 Hz Dimensions: 13-1/4?L x 9-5/8?W x 2-5/32?H